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  2. List of telephone country codes - Wikipedia

    en.wikipedia.org/.../List_of_telephone_country_codes

    Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.

  3. List of international call prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_international_call...

    This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...

  4. International direct dialing - Wikipedia

    en.wikipedia.org/wiki/International_direct_dialing

    An "international call prefix", "international dial-out code" or "international direct dial code" (IDD code) is a trunk prefix that indicates an international phone call. In the dialling sequence, the prefix precedes the country calling code (and, further, the carrier code, if any, and the destination telephone number ).

  5. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    The E.164 standard of the International Telecommunication Union is an international numbering plan and establishes a country calling code (country code) for each member organization. Country codes are prefixes to national telephone numbers that denote call routing to the network of a subordinate number plan administration, typically a country ...

  6. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    011 — access code for international direct dialing all destinations outside the NANP; 01 — international access code using operator assistance for all destinations outside the NANP; 101-xxxx — Carrier access code for selecting an alternative long-distance carrier; xxxx is the carrier identification code (CIC).

  7. Country code - Wikipedia

    en.wikipedia.org/wiki/Country_code

    In telecommunications, a country code, or international subscriber dialing (ISD) code, is a telephone number prefix used in international direct dialing (IDD) and for destination routing of telephone calls to a country other than the caller's.

  8. E.164 - Wikipedia

    en.wikipedia.org/wiki/E.164

    The number is presented starting the country calling code. This is called the globalized format of an E.164 number, and is defined in the Internet Engineering Task Force RFC 2806. [6] The international calling prefix is a trunk code to reach an international circuit in the country of call origination. [7]

  9. International call - Wikipedia

    en.wikipedia.org/wiki/International_call

    International direct dialling was introduced in the 1970s, so calls can be dialed by country code without an operator. International calls can be paid via telephone card (aka phone card, calling card). These popular telecommunications products allow users to initiate